我必须在线程创建方面分析一个非常大的C++项目。这不是我的项目，线程没有标记。线程的数量和选择因输入而异。
找出代码的哪一部分在运行时创建特定线程的有效方法是什么？
提前感谢！
在评论中，您提到了"示踪剂"的想法。 考虑到这一点，您也许能够利用LD_PRELOAD.
请考虑以下代码段...
#include <iostream>
#include <dlfcn.h>
#include <pthread.h>
#include <boost/stacktrace.hpp>
typedef int (*real_pthread_create_t)(pthread_t *thread, const pthread_attr_t *attr,
void *(*start_routine) (void *), void *arg);
static real_pthread_create_t real_pthread_create = NULL;
static unsigned thread_count = 0;
extern "C"
int
pthread_create (pthread_t *thread, const pthread_attr_t *attr,
void *(*start_routine) (void *), void *arg)
{
/*
* If real_pthread_create hasn't been fixed up yet then do it now.
*/
if (!real_pthread_create)
real_pthread_create = (real_pthread_create_t)dlsym(RTLD_NEXT, "pthread_create");
/*
* Increment the thread count.
*/
++thread_count;
/*
* Dump some stats and the call stack to cerr.
*/
std::cerr << "ncreated thread #" << thread_count
<< "nStack trace...n"
<< boost::stacktrace::stacktrace();
/*
* Delegate to the real pthread_create and simply forward its return value.
*/
return real_pthread_create(thread, attr, start_routine, arg);
}
将上面的代码编译成一个共享对象，类似于...
g++ -shared -fPIC -o pthread_catcher.so pthread_catcher.cpp
然后将其用作...
LD_PRELOAD=pthread_catcher.so ./path-to-main-application
对一些自行开发的代码的快速测试显示输出，例如...
created thread #7
Stack trace...
0# pthread_create in build/objs/how-to-analyze-which-part-of-code-creates-a-thread.so
1# 0x00007F311A7EF91C in /usr/lib64/dri/nouveau_dri.so
2# 0x00007F311A7EFD75 in /usr/lib64/dri/nouveau_dri.so
3# 0x00007F311A7E7E22 in /usr/lib64/dri/nouveau_dri.so
4# 0x00007F311AA08FF4 in /usr/lib64/dri/nouveau_dri.so
5# 0x00007F311AA09379 in /usr/lib64/dri/nouveau_dri.so
6# 0x00007F311AA9BC73 in /usr/lib64/dri/nouveau_dri.so
7# nouveau_drm_screen_create in /usr/lib64/dri/nouveau_dri.so
8# 0x00007F311A52FBC6 in /usr/lib64/dri/nouveau_dri.so
9# 0x00007F311AA00DB8 in /usr/lib64/dri/nouveau_dri.so
10# 0x00007F311A8D6042 in /usr/lib64/dri/nouveau_dri.so
11# 0x00007F311A8D144E in /usr/lib64/dri/nouveau_dri.so
12# 0x00007F311B6688FE in /usr/lib64/libGLX_mesa.so.0
13# 0x00007F311B640BA3 in /usr/lib64/libGLX_mesa.so.0
14# 0x00007F311B63C284 in /usr/lib64/libGLX_mesa.so.0
15# 0x00007F311B63CC9D in /usr/lib64/libGLX_mesa.so.0
16# 0x00007F3121BEBA50 in /usr/lib64/qt5/plugins/xcbglintegrations/libqxcb-glx-integration.so
17# QXcbWindow::create() in /usr/lib64/libQt5XcbQpa.so.5
18# QXcbIntegration::createPlatformWindow(QWindow*) const in /usr/lib64/libQt5XcbQpa.so.5
19# QWindowPrivate::create(bool, unsigned long long) in /usr/lib64/libQt5Gui.so.5
20# QWidgetPrivate::create_sys(unsigned long long, bool, bool) in /usr/lib64/libQt5Widgets.so.5
21# QWidget::create(unsigned long long, bool, bool) in /usr/lib64/libQt5Widgets.so.5
22# QWidget::setVisible(bool) in /usr/lib64/libQt5Widgets.so.5
23# main in ./build/applications/vnet/test00005
24# __libc_start_main in /lib64/libc.so.6
25# _start in ./build/applications/vnet/test00005